Differentiate An Interface And An Abstract Class?

1.	Differentiate An Interface And An Abstract Class?
Answer» An abstract CLASS may have many instance methods which sport default behavior. On the other hand, an INTERFACE cannot implement any default behaviour. However, it can declare DIFFERENT constants and instance methods. Whereas an interface has all the public MEMBERS, an abstract class contains only class members like private, protected and so on.

Answer»

An abstract CLASS may have many instance methods which sport default behavior.
On the other hand, an INTERFACE cannot implement any default behaviour.
However, it can declare DIFFERENT constants and instance methods.
Whereas an interface has all the public MEMBERS, an abstract class contains only class members like private, protected and so on.

Discussion